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Railroad car wheel bearing heat signal processing circuit

  • US 4,313,583 A
  • Filed: 03/31/1980
  • Issued: 02/02/1982
  • Est. Priority Date: 03/31/1980
  • Status: Expired due to Term
First Claim
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1. In a railroad hot box detector system of the type including infrared responsive scanner means associated with a sensing zone along a section of track adapted to scan bearings of a railroad car within said sensing zone and to generate an output voltage signal in response thereto having an amplitude and waveform indicative of the type of bearing being scanned and a sampling circuit adapted to sample the output of said scanner means into a preselected number of discrete samples the improvement comprising:

  • means for establishing a threshold signal level related to the average of the discrete voltage levels;

    means for determining the number of discrete samples falling between the crossing points of said waveform through said threshold; and

    means for averaging the discrete voltage levels of the samples falling between the crossing points whereby to obtain a signal indicative of the heat condition of the bearing being scanned.

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